Sadly yes, it's true, PC won't start, not even enough to access bios.
Well, it starts, thinks for a second, stops, starts again, rinse and repeat.
Hopefully it's just a dying PSU, and I've got an EVGA Supernova G3 80 Gold arriving tomorrow. 750 watts.
Really hope it's the PSU and nothing else but the CPU is just as old and so is the RAM...